Chimney-cowl



ATENT FFIQE THOMAS KEYS, OF CHICAGO, ILLINOIS.

CHlMNEY-COWL.

SPECIFICATION forming part of Letters Patent No. 471,388, dated March 22, 1892.

Application filed November 3, 1891- Serial No. 410.757, (N 11105.81

To all whom it may concern.-

Be it known that I, THOMAS KEYS, of Ohicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Ohimney-Cowls, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part of this specification, in which Figure 1 is a side elevation of an improved chimney-cowl embodying the features of my invention. Fig. 2 is a vertical longitudinal I sectionalview thereof; and Fig. 3 is a transverse vertical sectional view taken upon the line 3, Fig. 2.

Corresponding letters of reference in the different figures designate like parts.

The object of my invention is to so construct a chimney-cowl that it may act automatically in such a way as to insure a continuous and uniform draft of the chimney regardless of the direction. or the sudden changes and variations of the wind-currents.

To this end my invention consist-sin the combination of elements, hereinafter more particularly described and claimed.

Referring to the drawings, n represents the chimney-flue, which is provided with an enlarged base constructed in the usual way for the purpose of attaching the same to the masonry.- To the top of said flue is rigidly attached the body I) of the hood or cowl, which is flared outwardly at the ends, as shown in Fig. 1, being preferably longer at the top than at the bottom. The edges at the respective ends are wired, as shown at c, in order to impart rigidity to the structure, the ends d of said wires being bent in circular form for the reception of wires 6 6, attached to wings f f, which are thereby hinged to the respective ends of said hood. Extending transversely across the hood midway between its ends and about midway between the top and bottom is a cross-bar g, to which is attached at right angles thereto a bar h, which is so weighted at its lower end, as shown at i, as to normally retain a vertical position.

able by means of a set-screw, as shown. Rods j are loosely attached to the wings, re-

Said weight is rendered adj ustspectively, by means of eyes f the opposite ends of said rods being in turn loosely secured to the bar It, preferably at a point above its axis, as clearly shown in Fig. 3. The rods j are of sufficient length to permit the wings to stand out obliquely from the ends of the hood in an equal degree when the weighted bar h is in its normal position. It is obvious that when the pivoted or suspended bar it is in a vertical posit-ion a very slight force exerted upon either of the wings will cause it to swing, and when raised to its full limit it exerts the greatest resistance to the power which holds it there. This enables the device to respond readily to suddenly-shifting wind-currents and renders it so sensitive thereto that it is at all times protected upon the windward side, while the smoke-exit is correspondingly unobstructed.

My improved device is simple,durable, and cheap, and I have found in actual practice that it is so responsive to the slightest variation in wind-currents as to insure a perfect draft in chimneys that have been subjected to the most trying conditions.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

1. The combination, with a chimney-flue, of I said cowl, said bar being in operative connec- 

